Gotta meet your audience where they are. As a Mobile Safari user, the foremost way I feel my use of the web is crippled is that pages assume a bigger screen or are just poorly arranged.
This of all web pages ought to be easy to read on an iPhone screen, but the way it's constructed prevents it. You can't zoom the whole page out to see the entire table width because the table is in a scrolling frame and wider than its box. You can only scroll the nested frame sideways to see how row labels relate to iPhone cells. If you give up and use landscape, it still scrolls vertically in its frame. You have to aim for the margin or else you'll scroll just an inch and be halted because you caught the table.
Because it's critical that the web be as free as it is:
• It's natural that some pages turn out like this
• So it's natural the web is a little bit shitty all over
• So it's natural the demand for richer web features is low